One "feature" of Stack Exchange is that it is just as easy to post a "wrong" answer as it is a right one.
The beauty of crowd-sourcing is that many eyeballs should push the "cream" to the top and the "chaff" to the bottom. The mechanism for this, of course, is the vote. This is still and always will be the primary mechanism for sorting answers.
The problem is that votes indicate more than just "this is accurate" or "this is demonstrably false. Style, adherence to guidelines, etc... all play a part in the voting process.
This leaves a gap, however. Since the site, by definition, draws people who don't know the answer to every question, how can the experts differentiate between the "demonstrably false" or "demonstrably off-topic answer" and the "Meh. Just not the best presentation I've seen of this yet."
In particular, we have users who choose to ignore site guidelines about answers supposing to represent "groups" rather than individual opinion. Again, how do we differentiate answers that are representative of Christian groups' theologies from those that are not? How do we differentiate between say, a valid response representative of a minority viewpoint from that of an invalid "this is just my opinion on the matter"?